David Thewlis is an English actor whose most commercially successful role to date has been that of Remus Lupin in the Harry Potter film series. Other notable performances by Thewlis can be seen in the movies Timeline (2003), Kingdom of Heaven (2005), The Omen (2006), The Boy in the Striped Pyjamas (2008), London Boulevard (2010) and most currently, the Steven Spielberg-directed historical drama War Horse (2011).